Thread necro, I know. The dangers of a search function.
Nemeroff just released a book, "Mastering the art of the samurai sword." I was unfamiliar with him, but the book looked like it would at least be interesting, and if worst came to worst, I'd know how to answer if asked about him by a student.
My only observation of Mr. Nemeroff is that his grip on the sword was very odd in that his right hand was flush to the tsuka. He gave no practical reason as to his deviation in this area, so I have no choice but to consider it incorrect.
Any time I see tenth dan in anything I am generally suspicious. Since Mr. Nemeroff holds a tenth dan in several arts, that kind of raised my eyebrows. Mind you, I don't think that tenth dan automatically means fake, but I've seen enough rank inflation that I consider it a red flag.
Not being an iai or kenjutsu practitioner (we get some "iai" and "kenjutsu" in kendo, but not traditional iaido or kenjutsu), I don't have any comment regarding the authenticity of the techniques in the book.
I voted the last one, recommend something else. Here's my recommendation.
Seek out a good iaido school. He has his system of iai in the book, which may or may not be authentic material that has been repackaged and/or renamed, but you'd be better off learning the established art. Then you'd be in a better position to look at what he's doing and know if its on the level or not. Perhaps his system is good, maybe even great, but based on pics in a book and an accompanying DVD, I will reserve judgement.
The book also had a lengthy section of dojo etiquette, wherein the practitioners came in hakama in hand, weaing the keikogi and shorts. At first glance, it looked like they just had no pants on. They put on the hakama at some point after bowing in and in the dojo (as opposed to the dressing room).
Never seen that before!
Daniel